Back to results
US 2011/0255392 A1Published application
Optical pickup device
AssigneesSanyo Optec Design Co., Ltd., Sanyo Electric Co., Ltd.
InventorsYasuyuki Kano, Tetsuhisa Hosokawa
Life of this patent
Estimating the term…
Abstract
A semiconductor laser emits infrared laser light for CD and red laser light for DVD. A collimator lens and a CD/DVD objective lens have optical axes thereof aligned with an optical axis of the infrared laser light. The CD/DVD objective lens is mounted on a holder to be inclined in such a direction as to suppress inherent coma aberration of the CD/DVD objective lens, and to suppress astigmatism generated in the red laser light from a state in parallel to a reference plane of the holder.
Claims6
An optical pickup device, comprising:
- a first laser light source including a first laser element which emits first laser light and a second laser element which emits second laser light of a wavelength different from a wavelength of the first laser light, the first laser element and the second laser element being housed in a CAN with emission directions thereof being the same as each other;
- a collimator lens into which the first laser light and the second laser light enter;
- a first objective lens into which the first laser light and the second laser light transmitted through the collimator lens enter;
- a holder which holds the first objective lens thereon;
- and
- an actuator which drives the holder at least in a focus direction and in a tracking direction, wherein
- the collimator lens and the first objective lens are disposed at such positions that optical axes thereof are aligned with an optical axis of the first laser light, and
- the first objective lens is mounted on the holder to be inclined in such a direction as to suppress coma aberration of the first objective lens and to suppress astigmatism generated in the second laser light from a state in parallel to a reference plane of the holder.
5 more elements
Dependencies are inferred from the claim text.